The internet is a place where there is a wide range of information. Just a tip, internet users must clearly validate the source of information and how accurate the information being obtained. This way, the users can avoid any invalid information.

  Below are some websites that a teacher may visit to obtain further information about magnetic induction, AC and LC circuits, and application of electromagnetism. The authors would like to recommend to the teachers to read any university physics as the topics for Grade 12 Physics are obtained from university physics. 

(1) Introduction to Magnetic Induction -http://www.rpi.edu/dept/phys/ScIT/InformationStorage/faraday/magnetism_a.html

(2) Electromagnetic Induction - 

http://www.electronics-tutorials.ws/electromagnetism/electromagnetic-induction.html

(3) Experiments to Demonstrate Lenz's Law - https://www.nde-ed.org/TeachingResources/NDT_Tips/LenzLaw.htm

(4) Applications of Electromagnetic Induction - https://www.pa.msu.edu/courses/2014spring/PHY482/access/Posts14/Lec.10.06.pdf

(5) Electromagnetic Induction - http://www.santarosa.edu/~lwillia2/42/knightch34.pdf